These are instructions on how to downgrade your iPhone firmware using TinyUmbrella. In order to follow this tutorial you must already have saved your SHSH Blobs for the firmware you want to restore to.

You can use this tutorial to downgrade to iOS 4.3.3 in order to jailbreak using JailbreakMe. The Mac version of this tutorial is here.

Step One
Download TinyUmbrella from here and save it in a Pwnage folder on your desktop if don't have it already.

Step Two
Download the firmware you want to restore to from here and save it in a Pwnage folder on your desktop. Remember you must have saved your SHSH Blobs for this firmware already.

Step Three
Launch TinyUmbrella by double clicking its icon.

Step Four
Connect your device and make sure it lists saved SHSH Blobs for the firmware you are restoring to. You may need to click Save SHSH to restore your blobs from Cydia if you don't see any listed.

Step Five
Click the Start TSS Server button.

*Do not continue if TinyUmbrella's TSS server is not started successfully.

Step Six
Launch iTunes by clicking its icon in your Start Menu.

Step Seven
Place your iPhone into DFU mode by holding down the Power and Home buttons for 10 seconds then release the Power button and continue holding the Home button for another 10 seconds.

Step Twelve
Double click to launch the fixrecovery43 executable we just extracted.

Step Thirteen
FixRecovery will perform its magic after which your device will be successfully rebooted.

IMPORTANT:
● If fixrecovery does not work the first time you may need to rerestore to your desired firmware version and try again. Remember to keep the TSS Server running during your second restore as well.
● This tutorial does work to get your from iOS 5 beta back down to iOS 4. Although some have reported less issues with a lower version of iTunes this tutorial was tested to work with iTunes 10.5.0.77.